Against "Spam"

I won't bother railing against unwanted email solicitations (though it's true I consider this a problem that is basically solved and not worth complaining about). But I happened to notice today that the Thunderbird email client has taken a bold stand in refusing to label said email "spam":

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I agree with and approve of the decision. "Spam" is overly informal, and nerdy in its allusion to Monty Python. The term "junk mail" was already around and there's absolutely no reason it can't be applied to emails.